Security readout for executives and security teams
Plain-English summary
An authenticated OpenStack user can make Glance follow an HTTP redirect to an internal service during image import. This may expose sensitive internal responses and cause limited service disruption. The issue does not affect every Glance operation; exposure is limited to specified image-import methods and an optional plugin.
Executive priority
Prioritize remediation for multi-tenant or broadly delegated OpenStack environments because ordinary authenticated users may reach sensitive internal services through Glance. Treat internet-facing control planes and environments containing metadata, credentials, or management services as urgent. Validate feature exposure immediately, then patch through supported vendor channels.
Technical view
CVE-2026-34881 is a CWE-918 server-side request forgery caused by redirect-based bypass of Glance URL validation. It affects web-download, glance-download, and the optional ovf_process plugin. A network-accessible, authenticated user can trigger it without user interaction. CVSS 3.1 is 7.1, reflecting high confidentiality impact and low availability impact.
Likely exposure
Glance deployments are exposed when running versions before 29.1.1, 30.x before 30.1.1, or 31.0.0 and offering affected image-import functionality. The optional ovf_process plugin matters only where enabled. The source bundle does not establish whether affected import methods are enabled by default.
Exploitation context
Exploitation requires an authenticated Glance user and access to an affected image-import method. The attacker abuses HTTP redirects to reach services that URL validation should block. The bundle marks the CVE as absent from KEV and provides no evidence of active exploitation or a public exploit.
Researcher notes
The scope is limited to Glance image import and redirect handling. Version evidence identifies fixes for 29.x and 30.x, but the supplied description does not name a fixed 31.x release. Product packaging and backport status may differ; consult OpenStack and distribution advisories. No active-exploitation evidence is supplied.
Mitigation direction
- Upgrade affected 29.x deployments to Glance 29.1.1 or later.
- Upgrade affected 30.x deployments to Glance 30.1.1 or later.
- For 31.0.0, follow the OpenStack advisory for an explicitly supported fixed release.
- Restrict affected image-import methods until updates are completed, where operationally feasible.
- Disable the optional ovf_process plugin if enabled and unnecessary.
Validation and detection
- Inventory Glance versions across every OpenStack environment.
- Determine whether web-download or glance-download image imports are available to authenticated users.
- Check whether the optional ovf_process image-import plugin is enabled.
- Review image-import logs for redirects or destinations involving internal services.
- Confirm deployed packages match fixed versions or vendor-supported remediation guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-34881 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L2.84.2redhat-SADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N3.11.4mitreVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Base CVSS 3.1 score
5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- ADP timelineredhat-SADP
Reported to Red Hat.
- ADP timelineredhat-SADP
Made public.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-02-17T13:36:28.695Z: Reported to Red Hat.
- 2026-03-25T20:00:00.000Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- https://bugs.launchpad.net/glance/+bug/2138602CVE reference, mitre
- https://security.openstack.org/ossa/OSSA-2026-004.htmlCVE reference, mitre
- https://access.redhat.com/security/cve/CVE-2026-34881CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2440368CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34881.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:54757CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:39812CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.